Merged in chore/add-tests-to-getAdditionalPrice (pull request #3065)

chore: Refactor types and add tests to parts of price calcuations

* Add tests to sumPackages

* Refactor types and add tests to getAdditionalPrice

* Don't always generate coverage

* Add tests and refactor types of getRedemptionPrice


Approved-by: Joakim Jäderberg

packages/booking-flow/package.json

@@ -86,6 +86,7 @@
     "@types/react": "19.1.0",
     "@typescript-eslint/eslint-plugin": "^8.32.0",
     "@typescript-eslint/parser": "^8.32.0",
+    "@vitest/coverage-v8": "^3.2.4",
     "dotenv": "^16.5.0",
     "eslint": "^9",
     "eslint-plugin-formatjs": "^5.3.1",